Abstract: The invention provides a wall panel system including a supporting structure; and a plurality of plates (3), each plate having a first pair of edges (6) for engaging with the support structure and a second pair of edges (9), each plate being shaped such that the second pair of edges (9) conceal the engagement of corresponding adjacent plates with the support structure. In one preferred embodiment the supporting structure includes a mounting board (1) including a plurality of retaining elements (2) adapted for engagement with the first pair of edges (6) of each plate. Preferably each retaining element (2) includes a supporting lip (5), wherein the support edge (6) of a plate is engagable with a supporting lip (5) of a retaining element. The retaining elements may, for example, be arranged in a rectangular or square grid on the mounting board (1).